venom2049

Hey Guys,
Im here in this forum looking for advice in how to increase the power of the j32a engine without going turbo so it can be swap to a NSX. There is a fellow primer that started to work on a bracket kit to fit a J series engine on our NSX chassis, well everything went well with his project and Im very interested in his kit but I dont know anything about the J32a engine. So Im here to see if you guys can point me to a thread where I can get some info about increasing the power of the engine without going turbo ( I would like to keep it NA ). I saw a thread on the Accord forum where a guy increased the displacement of the J32 up to 3.7 , is there any stroker kit available for this type of engine?? Im looking to put my C30A engine to sleep and play with J32 with 350+ WHP if possible.

Here is the other thread about the j32 3.7L

J32 3.7 NA stroker built by Paul - Honda Accord Forum : V6 Performance Accord Forums

and here the thread on NSx prime about the swap

The "J" Swap - Page 9

I would really appreciate any tip or advice

Nico

Skirmich

Out megamod Fsttyms has done the 3.7 build on his TL.
He should chime in at a more reasonable hours.

skwidstyle2

yes what skirm said. fsttyms will have all of the info you need on any & everything j-series related ... he's either done it or knows how to go about it if its j-series related. if i'm not mistaken he's currently running a j35a3 - not a j32 (the block is exacty the same but starts you off with more hp & tq) - with the 3.7 J37a1 MDX cam & if i recall he's at around 330 to the wheels... heck maybe you'll end up one-uping the nsx j32 guys ...

venom2049

Seems like nobody cares to chime in here...

Skirmich

Seems like Fatty isnt in the mood.

KatabaticSaint

You could work with a J32A2 (02-03 TL Type S) but may I suggest looking at the J35A3 ((04-08 TL) pretty sure I got the years correct) you'd have more displacement and a newer engine for a very similar price. If you throw in the cams from the 07-08 TL type S and an 09 TL-SHAWD intake manifold you'll be knocking on 300 whp's doorstep. But like everyone here said fsttyms1 is the go to guy on these engines. Private message him if you want more information, he's a Mod for the forum so he's on here daily.

justnspace

iTrader: (1)

you posted at 2 in the morning.

and didnt even wait a full 24 hours....
impatient much!?

others gave you a starting point....
one of our moderators, fsttyms1 has built a 3.7 stroker engine.

https://acurazine.com/forums/second-...m-i-up-636644/

justnspace

iTrader: (1)

this route will be a little harder; because of cat placement and no true headers.

gnuts

iTrader: (1)

he shouldn't use the engine from the 04-08TL since the exhaust manifold is cast into the block. The J32A2 and J35A3 (01-02 MDX) can use proper headers and make more power.

To the OP: if you want a 3.7L then the cylinders will have to be bored out. You can go 3.6L without having to bore the cylinder by using a 3.7 crank. Either way it would be wise to work the heads on up. Big intake and throttle body to compliment it. Cams will compliment everything.

TBmotorworx does offer a stroker kit for the J series (3.7L). Obviously it would be pricier from them but that's an option.

Skirmich

^^ 3499 for the Stroker Kit they must be high....

KatabaticSaint

At least someone is having fun.

justnspace

iTrader: (1)

the OP was impatient


and now Im impatient for him to come back and answer us....
I cant hold my horses long enough, I hope he comes back

or else i dont know what im ever going to do.....

he wanted the info so bad he made himself disappear

gnuts

iTrader: (1)

lol, he just

I've read that NSX thread and they talk about not using the J35A3 but i have to disagree. what they should be doing is putting J32A2 heads on the J35A3 block. If you don't want to go into tearing apart an engine, that's an easy upgrade and would be much better than the J32A2. You wouldn't lose the top end and you would gain quite a bit of torque. Even putting the J35A3 engine in with just different cams would be much better. But 3.7 beats them all.

justnspace

iTrader: (1)

member Gerzand did just that with his TL on one of his ever going TL projects.

custom fab'd some headers to fit the 3rd gen TL.

Skirmich

^ In youtube there is a member who Retrofitted a J32A2 into his 3G TL-S and Yes I wrote that correctly.


Seems the reasoning is the higher stroke of the J32A2 can achieve more power when the Engine is Build/Tuned than a J35. Compression wise or so they say. When you wanna roll All Stock (Engine Internal Wise) or Plans on F/I the J35 is the better option.

fsttyms1

The J32 doesnt have a longer stroke, it has a shorter. If one were to build a motor simply for HP in theory you could achieve more with the J32/35 vs the J37. The shorter 86-93mm stroke (89mm bore) will allow you to rev higher with less piston speed vs the larger 96 mm stroke (90mm bore) of the 3.7. If you really wanted to make it rev you could do what youngone (robert is doing with his J25 build and his 71mm stroke) Granted this is all on how good a set of cams and valve train you have to handle the RPM (which is very doable)

venom2049

What would be the benefit of using a stroker kit 3.7L vs using an OEM crank? When the engine gets mod with a stroker kit or a crank plus lightweight pistons with higher compression, cams and all that good stuff a EMS is necessary correct?

gnuts

iTrader: (1)

the stroker kit that TBmotorworx sells probably uses an oem 3.7 crank. They don't list what's included in their motor for that price but i'm guessing it includes upgraded heads, porting/polishing, and agressive cams. And yes that would require tuning.

Tuning is always best, but there are guys who have/do run 3.5L, 3.6, 3.7 on the stock ecu (stock cams).

fsttyms1

^ Agree, that crank looks like a OEM Acura crank.

Im running the stock ECU with my 3.7 build but i know i will benefit from a way to tune it.

venom2049

I saw on their website - TBmotorworx - that the stroker kit seems to only include a crankshaft, pistons and the connection rods no cams or anything else. The cams are sold separately as well ad all the other components to upgrade the heads.

If I get a J32a engine, will the 3.7 crankshaft fit without mods or not?

gnuts

iTrader: (1)

Here is a mod list from a guy who had a nice 3.6L:

-J37 Crank and Rods
-J35 Pistons
-KMS Titanium Valve Springs and Retainers
-Ported and Polished Heads and Intake Runners
-Custom Cold Air Intake
-Equal Length Long Tube Headers; 1-7/8” Primaries, 2.5” Downtubes, 3” J-pipe
-Magnaflow High Flow Catalytic Converter
-Magnaflow Resonator
-Magnaflow Mufflers
-Mugen Thermostat, Fan Switch, and Radiator Cap
-Option Racing Lightweight Underdrive Pulley
-Hybrid Racing Aluminum Shift Bushings
-PSpec Tuning Short Throw Shifter
-Clutchmaster FX300 Clutch and Lightweigh Flywheel
-Clutch Dampening Device Delete
-XLR8 75A Engine Mounts

And the list goes on. That might help.

venom2049

Im more concern about the engine internals and upgraded parts to build the engine. Transmission parts, engine mounts, headers and those other external parts are already made or upgraded on the NSX right now but everything is base on a J32A engine.

justnspace

iTrader: (1)

it depends on your goals for the J-engine.
do you want to boost it?

stock internals are fine for a stroker build. as most just re-use stock parts.

So, if you wanted to spend the extra money to go with stiffer springs than stock, sure go ahead...

in the list that Gnuts provided for you, the dude is using titanium valve springs and retainers....

not sure how you skipped all that info..as I sound like a broken record.

venom2049

Like I said before I wanna keep it NA not boost. I read the list thats Why I said this build wont need any of the external/transmission upgrades that guy did. The Nsx transmission will bolt on with the J32A engine, the headers are custom made to fit the engine and the NSx exhaust.

My list is looking like this so far,

J32A engine
3.7 L Crankshaft
lightweight Hi. Comp. Pistons
( Will I need aftermarket camgears or the OEM will do? )
TBmotorworx Cams
Ported and Polished heads and intake runners
EMS
Custom Intake to fit NSX engine bay
Bigger Injectors

I might be missing something

gnuts

iTrader: (1)

pretty sure for a 3.6 you need J35 pistons and rods. If you're staying N/A i'd just use all oem parts (including cam gears). The J engines are rock solid and can take boost so just keep it simple. If you want to raise compression then you could mill the head.

Use a lightweight flywheel and get a light weight crank pulley. Everything else you listed looks good. You will have a very strong reliable motor if you do that and tune it well.

venom2049

Im looking to get the biggest engine displacement possible, I saw that the TBmotorworx has a J series build making over 400 BHPs. If I can make a J32A make 350+ all motor with OEM parts that would be great but I think for what Ive been reading that Im gonna need to get aftermarket cams and work the heads and upgrade the valvetrain to reach that goal. Ofcourse everything with a proper tuning.

justnspace

iTrader: (1)

that wasnt that hard.
you're looking at upgraded valvetrain + heads + cams.


except that I just saw that Bisimoto is going out of business.
their cams are no longer available.

they were just regrinds anyway.
you can send them off to a different company to have them regrinded.

venom2049

Tb motorworx sells 3 different styles of cams for the J series, I looked at bisimoto and I didn't see any cams for the J or maybe I didn't look hard enough :-P.

justnspace

iTrader: (1)

Find out who regrinds TBmotorworks cams.
then just go straight to the source.

I have the source in another thread; I just cant seem to remember the shops name.
Member, I_love_cars, used King Motorsports to build his engine.

here's the thread which details what King Motorsports did to the J35.
https://acurazine.com/forums/perform...mplete-897606/

complete with dyno's, detailed descriptions on why the cams can only be reground, etc.

justnspace

iTrader: (1)

here's a good current cam thread;
https://acurazine.com/forums/perform...-dynos-919824/

justnspace

iTrader: (1)

so, webcams is the company that regrinds.

venom2049

I thought Tb motorworx regrind their on cams or even make them Like TODA does for the C30A.

venom2049

I knew about webcams, they did a job for a friend of mine running cams very similar to the TODAs cams for the nsx just not as expensive.

venom2049

Here a picture of a fellow primer that started this swap on the NSX, his car is up and running.

fsttyms1

It will be a necessity for different or better cams and better springs at min (if you plan to rev any higher than stock redline, which you will if you want to maximise better cams and make more hp) and some head work for the J32A2 to reach its peak potential. Getting ITBs that are available for the NSX and finding a way to modify them to work could/would surely help. I have/used all OEM parts and built a 3.7 out of a J35A3 motor (the exact same block as the J32A2). You will have to bore the block 1mm to accommodate the 90mm pistons. Crank is a direct drop in other than a little grinding needs to be done on one end cap and a small amount on the block for the flange that the 3.7 uses for its crank trigger. It took me 5 min of work with a small air grinder to do the work.

With my 3.7 i can break free my 255/35/18s (both due to the LSD) if i dropped it down to 2nd at 50 and jumped on it, i have gotten the tires to spin going into 3rd on occasion

venom2049

Did you use the J35a3 block because thats what you had available at that time?? Since they are the same block why did you pick one over the other?? Just curiosity
Ive been looking for ITBS for the J series before I even posted anything here and what I found was a bunch out dated or incomplete threads of people trying to make a ITB kit.

Do you know whats the highest compression I can safely run on a 3.7L built?

I think I saw 12.5:1 somewhere but I cant find the thread :P

Skirmich

^ He used that block in specific because newer blocks don't fit the 6 Speed Manual Housing. J35A3 is a direct bolt on even to our Automatic Transmissions.

venom2049

Well in our case the J32A fits the NSx tranny.

fsttyms1

I used that block because i got it used for 400 bucks and i needed the one in the car to continue driving it till i got it rebuilt.

You wont find ITBs for the J. You will have to have something custom made. With a little fabrication im sure you could get something designed for the NSX to work.

Compression, I would say that really has more to do with the tune. 12.5 would be pretty easy to do granted you tuned it right (which is the biggest set back for the 2nd gen TL/CL guys as there is no good tuning solution for us without going to a full standalone.

fsttyms1

So will a J35A3, which is already a 3.5. Drop in the 3.7 crank and rods and you have a 3.6 without having to bore it.